Grinding and sharpening machine.



J. D. Vl-RDIN.

GRINDING AND SHARPEMIN G MACHINE. APPLIOATION 21121; 4:23.27, 1911.

Patented Aug. 1, 1911.

3 SHEETS-SHEET 1.

J. n. VIRDIN. GRINDING AND SHARPENING MADHINE.

APPLICATION FILED 193.27, 1911.

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GRINDING AND SHARPENING MACHINE.

APPLIOATION FILED APE.2'7, 1911. 999,610 Patented Aug. 1,1911.

3 SHEETS-SHEET 3.

UNITED STATES TATENT OFFICE.

JOSEPH D. VIRDIN, 0F BALTIMORE, MARYLAND, ASSIGNOR OF ONE-HALF TO I). M. WOLF, 0F MOUNT WASHINGTON; MARYLAND.

GRINDING AND SHARPENING MACHINE.

simple machine which will not easily get out of order and by the use of which the knife will be expeditiously given a cutting edge of the exact form desired.

A further object of the invention is to provide means whereby the knife may be ad -justed to various angles relative to the grinding wheel so as to produce any desired bevel on the cutting edge.

A further object of the invention is to provide improved means for adjusting the working parts to meet the varying conditions created by the wearing away of the grinding wheel or disk.

A further object of the invention is -to provide a machine of this character whereby a series of knives maybe sharpened or ground with their cutting edges identical in contour, in every respect, thereby enabling the use of said series of knives on a single revolving cutter head of a plan'ing machine.

Other, incidental dbjects of the invention will appear as the descri tion of the same proceeds and the novel eatures of the invention will be pointed out in the-claims at the end of the description. In the accompanying drawings, which fully illustrate my invention, Figure 1, is a lan view of the improved machine; Fig. 2 1s a front elevation of the same; Fig. 3 a vertical transverse section on the line 33 of Fig. 1; Fig. 4 is a' detail plan view partly broken away.

In carrying out my invention, I employ a. base or-bed plate 1 provided with transverse ways or tracks 2 m which a guiding'and supporting body 3 is slidably mounted. One track is integra with the bed plate or otherwise fixed while the other track is prefer ably detachable and has mounted therein ad- Specification of Letters Patent.

Application filed April 27,

Patented Aug. 1, 1911.

1911. Serial No. 623,678.

cause the travel of the said support to be.

true and straight throughout the life of the machine. At the back end of the bed plate posts 6 rise from the sides thereof while between said posts a transverse threaded bore 7 is provided in the bed plate. This threaded bore is engaged by the rear threaded end. 8 of an adjusting rod 9 which has a swiveled connection with the base of the support, as shown in Fig. 3, and is provided at its front end with an operating knob or handle 10.

On the upper ends of the posts 6 are bearings 11 in which is journaled a grinding shaft 12 having a driving pulley 13 fixed thereon between the posts and a grinding wheel 14, preferably an emery disk secured on its end. It will be understood, of course, that the grinding shaft may be extended more or less and provided with any number of grinding wheels. I have shown two such wheels, but such showing is merely illustrative and only one or any greater number may be employed without involving any departure from the invention.

The support comprises a lower sustaining inernber and an upper gage or guide mem- )er. yoke or fork having its side arms 15 carried laterally from its main body, as shown most clearl in Fig. 2, the extremities of the arms he equi ped with cap plates 17 which are socure upon the upper extremities of the upturned terminals 16by clamping screws or bolts 18. The upper gage or guide member of the support consists essentially ofa bar 19 having trunnions 20 at its" ends which extend between the. dapplatee, 1? and the upstanding members 16 which' 'lat trunnions. It will be readily noted that the trunnions form a-center abo'il p the bar may be sdjustedand tha, tigmay. be secured in anyauglo fh; ay be ggi'usted 'by turning 6 screws or" firmly upon the trignnions and thereby cause the same tdbindjhpon the upturned members 16. The bar. 194s provided 1n its front face with a longitudinal narrow groove 21 in which is secured a templetor The lower member in the form of a.

'Whiclif ts 18 so as to clampfthejcap plates 1T;

mg turned up, as shown at 16, and

ter are recessed or notched to meceive the, v

has an outline corresponding to the outline of the knife to be ground. This templet is secured in place by thumb screws 23 mounted in the bar 19 and extending up-into the bgroove 21 to bear upon the templet and bind the same against the upper wall of the groove. In order to accommodate templets of various widths, set screws 24 are mounted in the bar 19 and extend through the same from the rear thereof to enter the groove 21 and thereby hold the templet in such position that ever portion of its edge will project from the ront face of the carriage member to be engaged by the tracer. A longitudinal groove or trough 2 5 extends the full length of the member 19 in the top of the same and in this groove or trough is arranged a screw or worm 27, one end oi which is =swive1ed in a bearing 28, on the 20 member 19, and equipped with a crank handle 29 or other driving instrumentality.

Slidably mounted on the upper member or bar 19 of the carriage is a carriage con sisting of a base or track member 30 and a clamp member 31 slidably mounted therein. The track member rests firmly on the upper side or top of the bar 19 or upper pivoted member of the support and is pro vided on its under side with depending lugs 80 or ii s 32 which engage the side f the said meg er 19. It wil e observ on referen to Fig. 3, that the sides of the upper member 19 diverge upwardlyiand that the inner edges of the H s enga ng the same are correspondingly c amtered so that the lifting of the comma e from the support is prevented. One of t e lips is removable to facilitate assembling of the parts. The base member of the carriage is further proyided with a depending erforated threaded ear 3 which is engaged by the feed screw 27 whereby the carriage may be shifted longitudinally of the bar or member 19 which constitutes a track for the carriage. On the top of the carriage member 30 at the sides of the same, are overhanging ribs 34 providing a way which extends from front to rear of the machine and in which is slidably mounted the upper carriage member, or clamp bar 31, the side edges of this bar engaging under the overhanging flanges 34 as shown. Said bar is constructed on its upper side, at its rear end, with a boss 35 provided with a recess at its rear edge whereby it forms a jaw to receive the knife 36 to be ground. An upper clamping jaw or plate 37 is secured firmly upon the undr jaw or boss 35 and is also recessed at. its ear edge to fit upon the knife whereby j when the securing bolt 38 is tur ed home,

the knife will be firmly clampe between the jaws. In the forward portion of the clamp bar 31 is a slot 39 through which projects the upper end of a tracer-holder or ranger 40 having a cross bar or head 41 at y of each other.

its up er end projecting laterally beyond the wa is of the slot 39 to rest upon the up per side of the clamp bar and thereby suspend the hanger. Through the lower end of this hanger is inserted a tracer pin or point 42 which bears against the front or pattern edge of the tclnplet as shown. The tracer is held against turning in the tracerholder by a key l3 inserted through the front end of the tracer and engaging notches, recesses or grooves 14- in the front side of the tracer holder. A spring 45 is secured to and extends between the front ends of the members of the carriage and tends to draw the clamp bar rearward thereby holding the tracer against the templet and the knife against the grinding wheel. The tracer holder is adjusted along the slot 39 so as to bring the tracer into proper engagement with the templet by an adjusting screw 46 threaded through the tracer-holder and. swivelcd in the downturned front end of the clamp bar, being provided with a milled head 47 at its front extremity.

The operation will be readily understood from the foregoing description, taken in connection with the accompanying drawings.

The knife being secured in position and the .t-emplct and tracer being brought into proper engagement as shown and described,

the adjusting rod9 is manipulated to bring the knife against the grinding wheel. To bring the knife into the proper angular position to roduce any desired bevel on its cutting e go, the upper member 19 of the support is rotated on its trunnions and is clamped in its adjusted position by means of the cap plates 17 as hereiubefore stated. The grinding wheels are then rotated and the worm 17 manipulated to cause the car ria e to move over the support. The tracer wil be thereby caused to travel longitudinally of the templet and, following the sinuosities of the same, will impart a back and forth movement to the clamp bar so that the knife carried by the rear end thereof will be caused to move pastthe in an irregular path duplicating the path of the tracer and, consequently, will be ground exactly to the desired shape. While I have shown the worm or screw 27 as adapted to be operated by hand,it may be connected by a train of gearing with the motor which drives the grinding shaft and while I have illustrated only one carriage two or more ma be mounted on the support so thata plura ity of knives may be "round simultaneously, and have their ground edges exact duplicates Likewise when a series of knives are ground one at a time their grinding edges will be exact duplicates of each other so long as the adjustment of the mechanism is not altered Having thus fully described my inveninding wheel non what I claim and desire'to secure by Letters Patent of the United States 1. In a machine for grinding knives, the. combination of a bed plate, a grinding Wheel mounted on the bed plate in fixed relation thereto, a support comprising a base menr ber movable on the bed plate to and from the grinding Wheel and an upper member pivotally mounted on the ba e member, means for maintainingthe base member in its position relative to the grinding Wheel, means for he curing the pivoted member in angular relation to the ba e member, a Carri: ,g'e mounted on said pivoted member and adapted to more a knife past the grinding Wheel, and means l'or moving eaid earriage.

3, In a maebine for grinding knives, the eolnllinatioli ota bed plate, a grinding wheel mounted on the bed plate, in fixed relation thereto. a saipport eompri ing a ba;-,e member movabrwon the bed plate to and from the grinding, wheel and an upper member pivotally mounted on the base member, means for maintaining the base member in its position relative to the grinding, wheel, means for securing the pivoted member in angular relation to the base member. a templet on said pivoted member, a earriage eomprising a traek member movable alon; the pivoted member and a elamp bar movable back and forth upon the traek member and earrying the knife to be .sharpeued, a traeer holder suspended on the forward portion of the elamp bar, and a traeer mounted in the tracer holder and riding against the templet.

In testimony whereof I have signed my name to this speeilieatiou in the presence of two aub eribing wituessea.

JOSEPH I). VIRDIN. \Vit uesses:

Auteur W. CLARK, Jenn I". Jiujons. 

